Pen stops drawing after 32766 pixels

1

Greetings. The title of the post says it all. Here is an example:

(var image;

image = Image.color(40000, 40000, Color.new(0.9, 0.9, 0.9, 1));
image.draw({
	
	Pen.fillColor = Color.black;
	Pen.addRect(Rect(1000, 32000, 3000, 3000));
	Pen.fill;
});
image.plot
)

Any help will be much appreciated. This took a while to hunt down the problem.

2

I should add that it is in both directions

3

Sorry. I also meant to add that I am on Arch Linux. Hope that helps.

4

I don’t really know what your trying to achieve.

Do you come from the future ? I only have 1920 * 1080 pixels on my screen.

As expected, this saturated my RAM, I had to reboot :grinning: .

I think this is related to QT more than SuperCollider, see this thread that might be similar : Pen.addRect and Pen.addOval very slow .

I don’t think that QT was designed to work with those huge dimensions. That’s a lot of pixels. Subdividing / reducing the image, depending on your needs, might help.

5

I am generating an Image to export and print at high resolution. My ram does not get saturated. It just stops drawing.

6

Here is the first result of the google search “QT max pixel size” :

7

Thanks. That is a bummer. I will need to figure out a workaround…

8

That is strange that the background is still being drawn…

9

I think the QT limitation does not apply to other ‘real’ image manipulation software, like gimp, photoshop, or equivalents. I think that instead of creating a big image, you should subdivide it into 4, write them to disk, then call the external software to get them back together into a single file.

I think I would use ImageMagick to do that, because it’s ‘easy’ to use in command line.

10

Indeed. Unfortunately, that is not so easy the way I have implemented things…

11

This is only a limitation pre Qt 6 I think: qimage_p.h source code [qtbase/src/gui/image/qimage_p.h] - Codebrowser

12

Is it possible to compile sclang with qt6?

13

I doubt it. Two developers have started working on it, so it’s on the track, but still to come.

14

Here is where I was tracking it: General support ticket for Qt 6 · Issue #5169 · supercollider/supercollider · GitHub. I had a branch working with the 6.0 release candidate here: GitHub - mossheim/supercollider at topic/qt6

Since 2021 I no longer work on the project, it doesn’t seem anyone has made taken it up since then.

15

My bad Mossheim, didn’t see you worked on this before : Qt6 support · GitHub

dyfer and jrsurge have started working on this again : Comparing develop...topic/qt6-06 · supercollider/supercollider · GitHub

edit: They seem to follow what you proposed, no ?

As a note : I use QT extensively, and I’d like to participate in the implementation. But this kind of development is new to me, and I feel lost about what to do/where to begin. If you have any advice about this, do not hesitate to send me a PM.

16

Oh great :slight_smile:

If you have any advice about this, do not hesitate to MP me.

Nothing beyond what I already wrote in that ticket ^^